Browsing by Author "Chen, Mu-Zhe"

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Controlling the alignment of liquid crystals by nanoparticle-doped and UV-treated polyimide alignment films
(2012)
Jeng, Shie-Chang
;
Hwang, Su-June
;
Chen, Tai-An
;
Liu, Han-Shiang
;
Chen, Mu-Zhe
We have developed two approaches for controlling the pretilt angles of liquid crystal molecules by using conventional polyimide (PI) alignment materials either doping homogeneous PIs with Polyhedral Oligomeric Silsequioxanes (POSS) nanoparticles or treating homeotropic PIs with ultraviolet light. These techniques are very simple and are compatible with current methods familiar in the LCD industry. The characteristics of modified PI alignment films and their applications for photonic devices are demonstrated in this paper.
Growth of ZnO Nanorods and Their Applications for Liquid Crystal Devices
(2018-04-01)
Chen, Mu-Zhe
;
Yang, Sheng-Hsiung
;
Jeng, Shie-Chang
;
光電系統研究所
;
照明與能源光電研究所
Different morphologies of ZnO nanorods were synthesized by using the two-step hydrothermal method, and they were applied to liquid crystal (LC) alignment films. The morphology of the ZnO nanorods, including length, diameter, and density, were controlled by the growth time, which ranged from 16 to 26 min. The morphology and the chemical features both contributed to the surface wettability of the ZnO nanorods. The LC pretilt angle on the ZnO nanorods was successfully controlled from homeotropic (similar to 89.0 degrees) to homogeneous (similar to 1.7 degrees) alignments, as the contact angle of water on ZnO nanorods was changed from 93 to 28 with the growth time. The analysis of Xray diffraction and X-ray photoelectron spectroscopy showed that the crystallite size of ZnO nanorods increased with the growth time, while the oxygen vacancy decreased. The ZnO nanorods grown on the ITO glass substrate also improve the transmission of LCDs due to the antireflection effect.
Liquid crystal alignment on zinc oxide nanowire arrays for LCDs applications
(2013-12-02)
Chen, Mu-Zhe
;
Chen, Wei-Sheng
;
Jeng, Shie-Chang
;
Yang, Sheng-Hsiung
;
Chung, Yueh-Feng
The zinc oxide (ZnO) nanowire arrays on the indium tin oxide (ITO) glass substrates were fabricated by using the two-step hydrothermal method. A high transmittance similar to 92% of ZnO nanowire arrays on ITO substrate in the visible region was obtained. It was observed that the liquid crystal (LC) directors were aligned vertically to the (ZnO) nanowire arrays. The properties of ZnO nanowire arrays as vertical liquid crystal (LC) alignment layers and their applications for hybrid-aligned nematic LC modes were investigated in this work. (C)2013 Optical Society of America
Liquid crystal alignment on ZnO nanostructure films
(2016-01-01)
Chung, Yueh-Feng
;
Chen, Mu-Zhe
;
Yang, Sheng-Hsiung
;
Jeng, Shie-Chang
;
光電系統研究所
The study of liquid crystal (LC) alignment is important for fundamental researches and industrial applications. The tunable pretilt angles of liquid crystal (LC) molecules aligned on the inorganic zinc oxide (ZnO) nanostructure films with controllable surface wettability are demonstrated in this work. The ZnO nanostructure films are deposited on the ITO-glass substrates by the two-steps hydrothermal process, and their wettability can be modified by annealing. Our experimental results show that the pretilt angles of LCs on ZnO nanostructure films can be successfully adjusted over a wide range from similar to 90 degrees to similar to 0 degrees as the surface energy on the ZnO nanostructure films changes from similar to 30 to similar to 70 mJ/m. Finally, we have applied this technique to fabricate a no-bias optically-compensated bend (OCB) LCD with ZnO nanostructure films annealed at 235 degrees C.
Tunable Surface Wettability of ZnO Nanoparticle Arrays for Controlling the Alignment of Liquid Crystals
(2015-05-13)
Chung, Yueh-Feng
;
Chen, Mu-Zhe
;
Yang, Sheng-Hsiung
;
Jeng, Shie-Chang
;
光電系統研究所
The control of the liquid crystal (LC) alignment is very important for both academic- research and practical applications. ix molecules aligned on the ZnO nanopattide arrays (ZnO NPAs) are demonstrated and the pretilt angles of LCs can be controlled by using ZnO NPAs with different surface wettability. The wettability of ZnO,NPAsiabticated by the solution-based hydrothermal method can be controlled by changing the annealingtemperatiire of the as-prepared ZnO NPAs. The measurements of the energy, dispersive,Spectra and photoluminesoence have shown that the chemical properties of ZnO NPAs have been changed with the annealing temperature. Our results show that the pretilt angle of LCs can be tuned continuously from similar to 0 to similar to 90 degrees as the contact angle of water on ZnO NPAs changes from 33 to 108 degrees.